/*
 * Copyright (c) 2020 pig4cloud Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.titxu.cloud.common.log.util;

import cn.hutool.http.HttpUtil;
import com.titxu.cloud.common.core.util.IPUtils;
import com.titxu.cloud.sys.api.dto.LogDTO;
import jakarta.servlet.http.HttpServletRequest;
import lombok.experimental.UtilityClass;
import org.springframework.core.LocalVariableTableParameterNameDiscoverer;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.Expression;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import java.lang.reflect.Method;
import java.util.Objects;

/**
 * 系统日志工具类
 *
 * @author L.cm
 */
@UtilityClass
public class SysLogUtils {

    public LogDTO getSysLog() {
        HttpServletRequest request = ((ServletRequestAttributes) Objects
                .requireNonNull(RequestContextHolder.getRequestAttributes())).getRequest();
        LogDTO logDTO = new LogDTO();
        logDTO.setMethod(request.getMethod());
        logDTO.setParams(HttpUtil.toParams(request.getParameterMap()));
        logDTO.setIp(IPUtils.getIpAddr(request));
        return logDTO;
    }

    /**
     * 获取用户名称
     *
     * @return username
     */
    private String getUsername() {
        Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
        if (authentication == null) {
            return null;
        }
        return authentication.getName();
    }

    /**
     * 获取spel 定义的参数值
     *
     * @param context 参数容器
     * @param key     key
     * @param clazz   需要返回的类型
     * @param <T>     返回泛型
     * @return 参数值
     */
    public <T> T getValue(EvaluationContext context, String key, Class<T> clazz) {
        SpelExpressionParser spelExpressionParser = new SpelExpressionParser();
        Expression expression = spelExpressionParser.parseExpression(key);
        return expression.getValue(context, clazz);
    }

    /**
     * 获取参数容器
     *
     * @param arguments       方法的参数列表
     * @param signatureMethod 被执行的方法体
     * @return 装载参数的容器
     */
    public EvaluationContext getContext(Object[] arguments, Method signatureMethod) {
        String[] parameterNames = new LocalVariableTableParameterNameDiscoverer().getParameterNames(signatureMethod);
        EvaluationContext context = new StandardEvaluationContext();
        if (parameterNames == null) {
            return context;
        }
        for (int i = 0; i < arguments.length; i++) {
            context.setVariable(parameterNames[i], arguments[i]);
        }
        return context;
    }
}
